Novel NiO-modified Cu2O photocathode for photoelectrochemical water splitting

Abstract

A novel ITO/NiO/Cu2O structure served as photocathodes was applied in photoelectrochemical (PEC) water splitting for the first time. The NiO integration is found to slightly ameliorate the crystalline structure of Cu2O. PEC measurements showed that NiO-modified Cu2O photocathodes can deliver a higher PEC performance, as the photocurrent density was up to − 1.68 mA/cm2 at − 0.6 V versus RHE under simulated AM 1.5G illumination, which is 2.8 times higher than that of nude one. The enhanced PEC performance may come from the improved charge separation and migration properties of NiO modification.

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Acknowledgements

The authors gratefully acknowledge financial support from Tianjin High School Science and Technology Fund Planning Project (170401017), and Science and technology achievements transformation projects of Tianjin Chengjian University (201703235).

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Correspondence to Guangmin Li.

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Li, G., Wei, L. & Yang, Y. Novel NiO-modified Cu2O photocathode for photoelectrochemical water splitting. Appl. Phys. A 126, 306 (2020). https://doi.org/10.1007/s00339-020-03491-9

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Keywords

  • Cu2O
  • NiO modification
  • Water splitting
  • Semiconductors
  • Thin films